Pain after a root canal can be due to reinfection or crack in the tooth or inadequate cleaning during root canal.
We would need an x-ray and examination to decide whats causing the pain.
If the tooth structure is still intact and there is no crack - re root canal can be done if its a crack in the roots it would go for extraction.

Scaling and polishing is advised once in 6 months.
This time you go for a clean up ask your dentist to teach you hoe to maintain them as well.
Floss regularly, brush twice 3 minutes each,
change your brush every 3 months, do warm saline rinses regularly.

Go for scaling and polishing of your teeth, should be done once in 6 months.
Many things cause gum bleeding but the most common is gum inflammation which will improve after this
for further advise consult a dentist nearby maintain oral hygiene, brush twice for 3 minutes each change your brush every 3 months use dental floss to clean interdental areas.
Thanks.